Generative AI, All in One Place.
Industry AI Systems · Contract Dev · AI Advisory — all-in-one.
Having these problems?
Our generative AI specialists solve them with you
Want AI, but where to start?
You've tried ChatGPT. But how to integrate it? We design the first step together.
Is that dev quote fair?
Can't judge AI costs without expertise. Our advisors review and ensure a fair deal.
Manual work burning people out
Copy-paste, reconciliation, data entry on repeat. AI automates so people focus on decisions.
Here's how we solve it
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Ready-to-Use AI Tools
Industry-Specific AI Systems (β)
Leach by the numbers
40+
Companies supported (including individuals)
From enterprises to startups, we've helped businesses across industries adopt AI
Back-to-Back Wins
YCombinator Hackathon + Builders Weekend 2026 Tokyo
Won "The Biggest Engineering Lift" at YCombinator's hackathon. Two weeks later, won the VoiceOS Award at Builders Weekend 2026 Tokyo (205 participants, co-organized by Digital Garage). Both with international teams formed on the spot
9 Years
At Toshiba R&D — enterprise expertise, hands-on
Joint projects with Google and McKinsey. Youngest person seconded to the executive office. Understands both the tech and the frontline
All 12 AWS Certs
All 12 certs in ~1 month (typically takes a year)
Covers everything from infrastructure to applications. Clients say "every question gets an answer"
UTokyo AI 2nd
University of Tokyo × Toshiba AI Training — Session A Runner-up
Toshiba's highest-level in-house AI training. Selected top 3 out of 23 in a 3-month program. First awardee from the Software Technology Center
CTF 5th / 68
Toshiba Internal Security Contest 2022
Score: 3511 / 3551. Assessed at CISO role Level 5 (top level) across all roles under SecBok2016. Security expertise built in
Triple Award
DICOMO2014 Best Presentation + Outstanding Paper + DPSWS2014 Poster Award
Japan's largest IPSJ symposium. Competing against corporate researchers and engineers, won Best Presentation (1st / 293) as a graduate student. Also received Outstanding Paper Award and DPSWS Poster Award in the same year
JSSST Invited
Japan Society for Software Science and Technology — Annual Conference Tutorial Lecturer (2025)
Invited to Japan's prestigious JSSST annual conference, where past lecturers include professors from UTokyo, AIST, and Osaka University. Delivered the generative AI frontier to the academic community as a startup founder
Toshiba Tec × Google data business project (during Toshiba tenure)
Photo: Google Cloud Blog
Takuya Tominaga
CEO, Leach Inc.
Generative AI Dramatically Transforms Business. I'm Convinced of It.
After leaving, I visited companies everywhere. People using rulers on monitors to reconcile data. Copy-pasting by hand, over and over. Upstairs, flashy AI discussions. Downstairs, humans exhausted. Generative AI can change this. I was instinctively convinced.
"We want AI but don't know where to start." If that sounds like you, please reach out. We'll look at your operations together and find the best path forward.
Education: Born 1989. Master's from NAIST (Nara Institute of Science and Technology).
University: Interned at Akatsuki, Speee, and eXmotion — all three later went public (IPO). Won Speee Advanced Internship.
Toshiba — 9 Years: Covered HDD firmware (low-level) to AWS data analytics and web apps (high-level). Built an iOS chat app in Objective-C in 2013. Seconded to the executive office of subsidiary Toshiba Tec as the youngest ever. Worked on joint projects with Google and McKinsey.
Awards: Invited Lecturer at JSSST 42nd Annual Conference (2025) / DICOMO 2014 Best Presentation Award (1st out of 293) & Best Paper Award (double win) / IPSJ DPSWS 2014 Best Poster Award / 2nd place in University of Tokyo's 'Toshiba AI Engineer Training' / Toshiba Software Technology Center Outstanding Performance Award / Supercomputing Contest 2006 Finalist
Certifications & Patents: All 12 AWS certifications (achieved in ~1 month — unprecedented speed globally) / LPIC Level 3 / Patent holder (Patent No. 7086873)
Founding: Founded Leach, Inc. in November 2024. Won the Technical Award at YCombinator's hackathon "c0mpiled" in January 2026. Won the VoiceOS Award at Builders Weekend 2026 Tokyo in March 2026.
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